Treatment of hard and semi-hard copals and the preparation of varnishes.



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HENRI TEB'RIS SE, OF VERNIER, NEAR GENEVA, SWITZERLAND, ASSIGNOR, BY MESNE ASSIGNMENTS, TO FABRIQUE DE VERNIS ET PRODUITS GHIMIQUES (SOClETE ANONYME), OF VERNIER, SWITZERLAND, A CORPORATION OF SWITZERLAND.

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. Specification of Letters Patent.

' mn's'rnan'r or man AND SEMI-HARD .GOPALS AND ranrnna'rron or vamnsnns.

Patented April '7, 1908.

Application filed October 29, 1907. Serial No. $99,769:.

T all whom it may concern;

Be it known that I, HENRI TERRISSE, chemist, a citizen of the Confederation of Switzerland, residing at Vernier, near Geneva, Switzerland, have invented certain new and useful Improvements in and Relating to the Treatment of Hard and Semi-Hard, Co-

and British Patent N 0. 14,554 of 1903 disclose a method of dissolving hard and semi hard resins in si ccative'oils, which method nevertheless, the followi'n consists in first dissolvinglth e resins in naph thalene under ressure, t en adding oil to the solution so ro need and heating again under pressure. his methodis very good but has,

backs: Firstc' By heating oi under r'essure,

resins very readily coagulate, when the it is always decomposed; and this ecom s1t1on is serious 111 its results. Second: e-

oause of this decomposition, distillation under, vacuum is necessary. to remove the fatt acids which have-been formed. "Third: f the oil is not introduced underpressure, the

naphthalene is removed. Fourth: Although one works at relatively low temperatures nevertheless heating up to 290 C. is required Fifth: The distillation must always be -per-,

formed with great care after the oil has been heated underv pressure, as the heated liquid foams a great deal. In the method hereinafter described all these drawbacks are avoided, since the reactionsarever'y simple. Instead of using the naphthalene alone, .a mixture of this substance with resin oil or with ,oo al oil. in different proportions is used. his mixture may, for instance,-consist in two parts of ma hthalene and one part of one or the other oft ese two oils.

Neither the resin oil alone nor the copai oil dissolves easily the resins, when these oils are each usedalone as a solvent.' The copal oil would ive better results, if there did-not exist the ifliculty of removing it, which reserious draw-' I quires raising the temperature to a very high with the na hthalene are carried out of the alembic by t e vapors of the naphthalene and ma be therefore withdrawn between 270 C.

varnishes are cooked.

and the Kauri copals and also certain'klnds of Congo resin. For dissolving the resins from. Congo, Camerohn, An ola, Benguela, Acra, Sierra Leone, Brazi Mada ascar, Kiseel, Zanzibar, -etc.,'they must be sated with the abe ve described naphthalene-and-oil mixture at temperatures of 240 C. to 265 C. and at pressures varying fromtone and onehalf to two. and one half. "atmos heres. These solutions, which are obtaine quickly by using this method, are very pale.

The following examples of my new method are given:

a stirring device are introduced 200 vkilooil; and lOl) kilograms of Manilaco al. The whole is heated to ri'oiling, which ta es place at 215 0.; at this moment, all the resin is the interior of the distilling apparatus reaches 280 C. ThenlOO kilograms of linseed-oil are added in small quantities at a' time and one must take care that after each addition the temperature rises to 280 O; the lid is lifted and heating is carried on for about half an hour, While stirring the liquid, Thelast traces of naphthalene and resin oil are removedat the end, of this time. The varnish is completed by adding a new supply ofoil, if necessary, and spirit of turpentine and siccativej Second ewcmple.lnto an autoclave boiler provided with a stirrin duced 200 kilograms o naphthalene; 100 kilograms of copal oil; and '100 kilograms of Zanzibar oopal. hour at' a temperature of 265 C. and at a pressure of from two to two and a half atmospheres. At the'end of this time the solution is completed. This. solution is then poured into a still and the process completed as in the first example.

point (340 C. to 360C.) -These Oils mixed The above described mixture dissolves" Without the use of pressure the Manila copals grams of naphthalene 100 lnlograms-oi resin The whole is heated for one The principal advantages of this process an 280 (3., the temperatures at which the v very First example-Into a still provided with dissolved. The mixture of naphthalene and resin oil is distilled until the temperature of device are intro- I are the following: First: The temperature of solution of the resins is reduced by about 40 C; from Which it results that the resins are much less decomposed by using the present method than by using the method described in the above mentioned patents. Second: No vacuum distillation is required. Third: No foar'n' is produced during the distillation. Fourth: No heating the oil under pressure is required, Fifth: There is a saving of time and fuel.

I claim: 1. A step in the herein described process for the preparation of varnish consisting in heating a mixture of naphthalene, oil and a resin until the resin is dissolved; and then boiling the solution so produced to remove the naphthalene and oil.

- 2. A step in the herein described process for the preparation of varnish consisting in, heating a mixture of naphthalene, oil and a eeaeee resin until the resin is dissolved; boiling the solution so oroduced to remove thenapntha-l' lens-and oil; and adding linseed oil,'wlnle 'and oil; adding linseed oil, While maintaining the mixture at a temperature of about 280C; and, lastly, adding spirits of turpentine and a siccative.

In testimony whereoi I have affixed my signature in presenceof two Witnesses.

ennui rsnnissn.

Witnesses L. H. MINIEE,. R. DE WURTTEMBERGER. 

